package tech.dongliang.common.converter;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;

import java.nio.charset.Charset;

@Configuration
public class FastJsonConverters {
    /*注入Bean : HttpMessageConverters，以支持fastjson*/
    @Bean
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        FastJsonHttpMessageConverter fastConvert = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();

        SerializerFeature[] serializerFeatures = new SerializerFeature[]{
                //  输出key是包含双引号
//        SerializerFeature.QuoteFieldNames,
                //  是否输出为null的字段,若为null 则显示该字段
//        SerializerFeature.WriteMapNullValue,
                //  数值字段如果为null，则输出为0
//                SerializerFeature.WriteNullNumberAsZero,
                //   List字段如果为null,输出为[],而非null
                SerializerFeature.WriteNullListAsEmpty,
                //  字符类型字段如果为null,输出为"",而非null
                SerializerFeature.WriteNullStringAsEmpty,
                //  Boolean字段如果为null,输出为false,而非null
//                SerializerFeature.WriteNullBooleanAsFalse,
                //  Date的日期转换器
//                SerializerFeature.WriteDateUseDateFormat,
                //  循环引用
//                SerializerFeature.DisableCircularReferenceDetect,
        };

        fastJsonConfig.setSerializerFeatures(serializerFeatures);
        fastJsonConfig.setCharset(Charset.forName("UTF-8"));
        fastConvert.setFastJsonConfig(fastJsonConfig);
        return new HttpMessageConverters((HttpMessageConverter<?>) fastConvert);
    }
}
